Healthy Blueberry Crumble Bars

These Blueberry Crumble Bars are so easy to make. Imagine fresh blueberries on a gluten-free, oatmeal-infused crust and more of that crust served as a top layer crumble! This will be your favorite oatmeal bars recipe! Make these bars for breakfast or dessert!

A blueberry oatmeal bar sits on a white plate with lots of blueberries around it.

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The Magic of Blueberry Crumble Bars

Blueberry crumble bars are so perfect right now. Because summer is in full swing. How do I know this? Because the lawn mowers are out!

You know hot that goes, right? You head outside to enjoy a peaceful day in the summer — maybe to enjoy some time in the hammock or porch swing…read a good book — and boom! Out comes the lawn mowers!

Sometimes? I think they’re waiting for me. Because it’s all clear until I get all settled in outside. It’s a little like Bugs Bunny stepping out onto the road. You know the one I’m talking about? No cars in site until he dips his toe on the road and suddenly cars are speeding by.

That’s me and lawn mowers and my back yard.

I guess that’s why we have earbuds. Amiright? 🤗

Fresh blueberries sit in the bottom of a pot ready to be placed on the stove.

Blueberry Sauce

I begin my blueberry crumble bars with fresh blueberries. You can use frozen if you’d like, and depending on the time of year, frozen may be the best option. For example, in the winter months when fresh blueberries are more expensive, frozen will work just fine.

Here are the ingredients in the blueberry part of these blueberry crumble bars:

  • blueberries
  • water
  • agar agar flakes
  • lemon juice
  • agave nectar

Simply bring these ingredients to a boil, cook for a few minutes and transfer to a bowl and refrigerate. Soon you’ll have a nice, thick blueberry sauce!

Wait. Did I lose you with the agar flakes? I hope not! Because agar agar flakes are so easy to work with. Imagine it like the gelatin of the sea! You don’t need to use gelatin because agar agar flakes work the exact same way!

It’s pretty easy to buy agar agar flakes too. You can find them at health food stores, like Sprouts or Natural Grocers. And, then there’s Amazon. I was able to buy 3 packages of agar agar flakes on Amazon for a relatively affordable price there.

Dry ingredients and wet ingredients on separate sides of a white bowl.

How do I make a crumble?

There are lots of ways to make a crumble, but the basic idea is to combine flour, sugar, and fat so that it’s thick, like cookie dough. Typically this is used to create a crust topped with a filling and additional crumble baked on the top.

For today’s blueberry crumble bars, I’m going gluten-free and all healthy on you! But don’t tell anyone, because these taste SO good, no one will realize they’re actually healthy!

This delicious gluten-free crumble is made with the following ingredients:

  • oats
  • almond meal
  • ground flax seeds
  • baking powder
  • salt
  • applesauce
  • agave nectar
  • almond butter
  • plant-based milk
  • vanilla
  • apple cider vinegar

That’s it! I like to start by combining the dry ingredients in a mixing bowl. Next, I scoot those dry ingredients to one side and mix the wet ingredients on the other half of the bowl. Then gradually stir it all together.

Finally, press about three quarters of the mixture into the bottom of a square baking dish sprayed with vegetable spray.

The batter for this oatmeal bars is pressed into the bottom of a square baking pan.

Healthy Berry Crisp

What makes these blueberry crumble bars healthy? First of all, they’re free of white, refined sugar. That’s great news because it’s good to keep an eye on that. We’re learning every day about the importance of reducing refined white sugars in our diets. I used agave nectar in this recipe. It’s affordable and agave nectar has been shown to be more beneficial than sugar.

In addition to the type of sweetener used, I also kept it pretty minimal. In fact, if you have a sweet tooth, you may be inclined to increase the sweetness in this recipe just a tad to meet your needs.

I find sweetness to be one of those things that is quite variable from person to person. Thus the saying, “One person’s raisin is another one’s candy.”

Something like that!

Also, this recipe is made with healthy fats, like almond butter and even the almonds from the almond meal adds healthy fats to this recipe.

Finally, there’s just lots of great healthy ingredients in this recipe, like applesauce and oats that add fiber, nutrients, and the right ingredients to give this crumble texture and flavor!

If you love healthy, berry-infused sweets, check out my Blackberry Banana Chia Pudding! I know. It’s amazing!

Fresh from the oven, these oatmeal blueberry crumble bars are surrounded by fresh blueberries.

Gluten Free Berry Crisp

I made this blueberry crumble recipe gluten-free by skipping out on the wheat flour. You know, I could have used a whole wheat pastry flour, but I thought using oatmeal would be a nice touch. In addition, I used almond meal to add healthy fats and additional texture to the bar part of this recipe.

I’m not picky about where I buy my oats because I don’t have celiac. Oatmeal in and of itself is gluten-free, but sometimes it can be processed in facilities where gluten products are also produced. If you’re highly sensitive to gluten, you will want to buy oatmeal that’s certified gluten-free.

Alternatively, here’s a blueberry lemon pie bar that is not gluten-free. You know. So you have options!

A slice of oatmeal blueberry bars sits in the foreground with another slice behind it.

We hope you love this recipe for Blueberry Crumble Bars! We sure did! If you decide to make it, be sure and snap a photo and share it with me using #namelymarly on Instagram. I love seeing your photos!

A blueberry oatmeal bar sits on a white plate with lots of blueberries around it.

Blueberry Oatmeal Crumble Bars

These Blueberry Oatmeal Crumble Bars make a delicious breakfast with health oats and a gluten-free crumble, but you can serve them for dessert too.
Print Pin Rate
Course: Breakfast
Cuisine: American
Keyword: Blueberry Oatmeal Crumble Bars
Prep Time: 10 minutes
Cook Time: 25 minutes
1 hour
Total Time: 35 minutes
Servings: 9
Calories: 324kcal
Author: Marly


Blueberry Filling

  • 3 cup blueberries , fresh or frozen
  • ½ cup water
  • 1 tablespoon agar agar flakes
  • 1 teaspoon lemon juice
  • ¼ cup agave nectar (or maple syrup/honey)

Oatmeal Crumble

  • cups rolled oats
  • 2 cups almond meal
  • 1 tablespoon ground flax meal
  • ½ teaspoon baking powder
  • ¼ teaspoon sea salt
  • ½ cup applesauce , unsweetened
  • cup agave nectar (or maple syrup/honey)
  • ¼ cup almond butter
  • ½ cup plant-based milk
  • teaspoon vanilla
  • 1 teaspoon apple cider vinegar


  • Heat your oven to 350F. Spray a square baking dish with vegetable cooking spray.
  • Place blueberries in a saucepan. Add the water and agar flakes to the blueberry mixture and stir to combine. Bring this to a boil over medium high heat. Once it begins to boil, reduce heat to medium and simmer for about 5 minutes, stirring occasionally. Remove from heat.
  • Pour the lemon juice and agave in the blueberries. Stir to combine. Transfer to a bowl and refrigerate. 
  • Combine the oats, almond meal, flax meal, baking powder, and sea salt in a bowl. Stir to combine. Scoot the ingredients to one side of the bowl. In the other half of the bowl combine the applesauce, agave nectar, almond butter, milk, and vanilla. Stir to combine. Then stir the wet and dry ingredients together. Add a tablespoon or two of water if necessary.
  • Take 3/4 of that oats mixture and press evenly across the bottom of your prepared pan. Set the rest of the batter aside.
  • Place the crust in the oven and bake for 15 minutes.
  • Remove crust from the oven. Check the blueberry filling. It should have thickened by now. Spread it over the baked crust.
  • Place dollops of the remaining crust batter distributed equally over the blueberry filling. Return to the oven and bake for 10 minutes, until the top crust turns golden brown. 
  • Remove from oven and set aside to cool before refrigerating to allow the filling to set completely.


Updated by Marly · Permalink